My boyfriend kids uhhhhh

me and my boyfriend have been together for a year and a half I'm 33 weeks pregnant I have a 4year old and a 6year , he also has 2 kids ages 8 and 5 idk if it's because I'm pregnant but his kids irritate the hell out of me to the point where I stay in my room he has both of them for the summer and I'm just ready for them to go homeeeeeeeee. the 8 year old is always being sneaky making the other kids cry I seen him a few times hit the other kids then he will lie and say he didn't i told him a few times thats not nice dont do that then he also still piss in the bed every night and he's (8) years old he has no medical problems says his dad I don't understand WHY . then his 5 year old son cannot do anything by his self when he boo boo he still ask for help with wiping his butt , I taught both of my kid how to properly wipe themselves then he does not even know how to put his own clothes on my 4 year old know how to dress herself properly I told his dad to teach him how to put his things on because he have to learn one day the reason I'm writing this story is because I need ways to keep my cool at least until they go back home for the summer being 8 months pregnant and dealing with them is really becoming a task . it's a lot more but it will take me forever to write everything